Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
High Pressure Fuel Injector Control Module (HDEV)
- Is there a Test Plan available for the HDEV? ________________________________
- Select Control Unit Functions (MED 9.2.1), Diagnosis Requests. Is there a status under the "Part Functions" column for observing the HDEV injector output? __________________
- What are the pin and connector numbers at the ECM (1 or 2) for the fuel injector output request? Connector _____________ Pins _______________
____________ ____________
____________ ____________
- Record the voltage value at one of these pins with:
The engine not running (ignition on). _________ V
Engine running at idle speed. __________ V
Rev engine up to 2000 RPM. __________ V
- What are the pin and connector numbers at the HDEV (1 or 2) for the output control of one of the fuel injectors? Connector ___________________ Pins ___________________
voltage ground
Ask the Instructor for assistance:
- Using the ground pin of this fuel injector at the HDEV, record the voltage value with:
The engine not running (ignition on). _____________ V
Engine running at idle speed. ____________ V
Rev engine up to 2000 RPM. ______________ V
- Use the MFK 2 cable to observe a scope pat-
tern from the same pin and record that pattern on the right (engine at idle speed) .
Hint: Start out with a scope setting of 10Hz at 100 V for MFK 2 (Channel B) .
Increase the engine speed to 2000 RPM and observe pattern .
Courtesy of BMW OF NORTH AMERICA, INC.
HDEV activation (sample shown to the right):
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.